Recent studies have shown that restrained occupants over the age of 50 in frontal crashes have a higher risk of injury in the rear seat than in the front, and have hypothesized that the incorporation of technology such as belt pre-tensioning and force limiting preferentially in the front seat is at least partially responsible for this trend. This study investigates the potential benefits and trade-offs of seat belt pretensioners and force-limiters in the rear seat using a series of frontal impact sled tests at two speeds (48 km/h and 29 km/h Delta V) with a buck representing the interior of the reat seat occupant compartment of a contemporary mid-sized sedan. Four different dummies were tested: the Hybrid III six year old (in a booster seat, H3 6YO), the Hybrid III 5th percentile female (H3 AF05), the Hybrid III 50th percentile male (H3 AM50), and the THOR-NT. The restraints consisted of either a standard three point belt, or a 3-point belt with a retractor pretensioner and a progressive force-limiter (FL+PT). Each test condition was repeated in triplicate. The FL+PT restraints (compared to the standard restraints) resulted in a significant (p less-than or equal to 0.05) decrease in peak internal chest deflection for each of the Hybrid III dummies at both test speeds (48 km/h: 29 % decrease for H3 6YO, 38 % decrease for H3 AF05, 30 % decrease for H3 AM50), and for the THOR-NT at a Delta V of 29 km/h. At 48 km/h, the FL+PT restraint qualitatively decreased the average peak internal chest deflection of the THOR-NT, however this decrease was not statistically significant (p = 0.06). Furthermore, the FL+PT system allowed little or no increase in forward head excursion, and improved whole-body kinematics for all dummies by restricting pelvic excursion and slightly increasing torso pitch. The results suggest that the FL+PT system studied here may provide injury-reducing benefit to rear seat occupants in moderate to high severity frontal crashes, although more study is needed to evaluate these restraints in other crash scenarios.


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    Titel :

    Occupant restraint in the rear seat: ATD responses to standard and pre-tensioning, force-limiting belt restraints


    Weitere Titelangaben:

    Rückhaltesysteme für Fahrzeuginsassen auf dem Rücksitz: ATD-Reaktionen auf Standard-Sicherheitsgurte und solche mit Vorspannung und Kraftbegrenzung


    Beteiligte:
    Forman, Jason (Autor:in) / Michaelson, Jarett (Autor:in) / Kent, Richard (Autor:in) / Kuppa, Shashi (Autor:in) / Bostrom, Ola (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    13 Seiten, 28 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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